<?php
class LtConfigExpression
{
    private $_expression;
    public $autoRetrived;
    public function __construct($string, $autoRetrived = true)
    {
        $this->_expression  = (string) $string;
        $this->autoRetrived = $autoRetrived;
    }
    public function __toString()
    {
        return $this->_expression;
    }
}